The week in pictures: 1 April 2011

Using a fisheye lens, photographer O Chul Kwon captured a 180-degree view of the sky as curtains of northern lights danced in the sky above Enodah Lodge in Yellowknife, Canada. Astrophotographer O Chul, 36, born in Korea, said: "I was taking shots of quite minor aurora when suddenly the aurora became very bright. The whole snowy landscape was dyed with fluorescent green colour. It was like a Wonderland."